Economizer



May 6, 1930. o. DE LORENZI 1,757,621

ECONOMIZER Filed 0G17. l, 1927 fyi . L l5 2i" xNvENTOR ATTORNEY5 Patented May 6, i930 UNITED STATES PATENT lori-'ics OTTO DE LORENZI, OF MAPIEWOOD, NEW JERSEY, ASSIGNOR T INTERNATIONAL COM- BUSTION ENGINEERING- CORPORATION, 0F NEW YORK, N. Y., A CORPORATION 0F DELAWARE Application led October 1,

This invention relates to apparatus such as economizers, reheaters, superheaters, and the like, and one of its primary objects is to provide a simple, compact and ecient appa- 4ki ratus of this character.

Another object of the invention is to provide a device of this character inwhich corrosion of certain of the parts is effectively prevented.

A more specific object of the invention is the provision of novel supporting means for the tubes.

How the foregoing, together with such other objects and advantages as may hereinafter appear, or are incident to my invention, are realized, is illustrated in preferred form in the accompanying drawings, wherein- Fig. 1 is a front elevation of an economizer embodying my invention with a portion thereof appearing in section.

Fig. 2 is an enlarged fragmentary longitudinal section through a portion of the economizer, the section being taken on the line 2 2 of Fig. 3, and

Fig. 3 is a cross section of Fig. 2 taken on the line 3--3 of Fig. 2.

Referring to the drawings, the eeonomizer comprises, in general, a casing A having an inlet 4 for a heating medium, such as flue gas, and an outlet 5 for said medium; a plurality of rows of tubes B, the tubes in this instance being horizontally disposed and connected at their ends for back and forth traverse therethrough of water or other medium to be heated, and supports C, C for the tubes of the rows of tubes. j

The tubes of one row are offset with respect to the tubes of the adjacent row as shown in Fig. 3,' and they are provided with longitudinally extending ns 6, preferably welded thereto, which ins cooperate with the tubes to provide -a multiplicity of passes or divisions through which the gases pass, as will be clear from inspection of Fig. 3. The fins 6 transmit heat by conduction to the tubes B. It will be understood that the gases are caused to traverse the passages at fairly high velocity and that, in traversing the pas sages, the ases are alternately deflected from tube to tu producing a thorough scouring ECONOMIZER 1927. Serial No. 223,301.

or sweeping of metallic surfaces which, in

addition to obtaining effective heat transmission, minimizes the incrustation which takes place on the exterior of the heating surface. Efficiency is further increased by virtue of the fact that the water also traverses the tubes very rapidly, for the reason that it is possible to employ small tubes. This rapid flow in accordance with well known principles, increases eficiency and minimizes the formation of deposits or internal incrustations.v Thus, the device can be operated for long periods without cleaning.

Referring now to the manner of connecting the tubes, it will be seen that the tubes of the lowermost row of tubes are connected into an intake header 7 and the water traverses the length .of these tubes to the junction blocks 8, which may be of any one of a number of dierent kinds available for this purpose, and which connect the discharge ends of the tubes of the first row with the intake ends of the tubes of the next row. `The water then traverses this second row of tubes to similar junction blocks or boxes 8 at the opposite ends which connect theI discharge ends of the tubes of the second row with the intake ends of the tubes of the next row from which the water traverses this next row and so on. Ultimately, the water enters the outlet header 9 into which the tubes of the uppermost row connect. The junction blocks 8are provided with readily detachable plugs 10 located in line with the tubes whereby access may be had to the tubes for cleaning and replacement purposes.

The supports C, C for the tubes of the rows bers are stiffenedby means of the marginal ianges 11 and ribs 12. In addition to their stif'fening feature, the ribs and flanges provide pockets, in this instance of diamond shape, for receiving filling material 18, such as refractory material, which acts as a seal to prevent gases from leaking past the supports C, C, into the end chambers 14, 14, provided between the supportsand the end walls 15 of the casing A. Thus, it will be seen that the supports together with the filling material not only serve to support the tubes, but, in addition, serve as baflies or partitions providing chambers in the casing sealed against the entrance of gases thereto. The tubes B project through these partitions and the junction blocks 8 above referred to are located in the chambers thus provided.

From the foregoing it will be seen that gases are prevented from coming in contact with the headers which is important for the reason that should a tube leak at the junction block and the water from the leak come in contact with the flue gases containing a higher percentage of sulphur dioxide, and acid would be formed and the tube would corrode very rapidly.

It is pointed out that by having the junction boxes spaced somewhat from the supports, I am enabled to incline the tubes if desired without interference with the supports. Space is thus also provided for moving the bones toward the supports to facilitate repa1rs.

In connection with the supportsC, C, it is to be observed that the openings 16, see Figs. 2 and 3, in which a tube is omitted to clearly show the openings, corres ond in contour to the cross section of the tu es with their fins, by virtue of which I am enabled to readily remove the tubes from the end when replacement is necessary. A convenient method of applying the filling material 13 is to employ a form having holes corresponding in shape and spacing to the holes in the supports.

In the particular embodiment shown, the water enters the economizer at the bottom and the gas at the top, this for counteriiow purposes.

1. An economizer including a casing having a gas inlet and a gas outlet, a plurality of rows of tubes in said casing connected for back and forth traverse therethrough, and means for supporting the tubes of said rows comprising flanged and ribbed tube sheets located adjacent the ends ofthe tubes, together with filling material in the pockets provided by the flanges an'd ribs of the tube sheets.

2. An economizer including a casing having a gas inlet and a gas outlet, a plurality of rows of tubes in said casing connected for back and forth traverse therethrough, and means for supporting the tubes of said rows comprising anged and ,ribbed tube sheets located adjacent the ends of the tubes, t0- gether with filling material in the ockets provided by the flanges and ribs of t e tube sheets, said tubes being provided with longitudinal ns, and said tube sheets having holes corresponding in contour to the cross section of the iinned tubes.

3. An economizer including a casing having a gas inlet and a gas outlet, a plurality of rows of tubes in said casing connected for back and forth traverse therethrough, and means for supporting the tubes of said rows comprising tube sheets having means adapted to receive filling material.

In ltestimony whereof I have hereunto signed my name.

OTTO DE LORENZI. 

